KROHNE OPTISWIRL 4070 ATEX II2G EN - Manual (Page 14)

4
ELECTRICAL CONNECTIONS
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OPTISWIRL 4070
www.krohne.com 04/2013 - 4000077105 MA OPTISWIRL4070 II2G AD R05 en
4.4 Earthing and equipotential bonding
For compact measuring devices and measuring sections with flange connections, the connection
may be made via a conducting connection of the sensor to the pipe. For compact measuring
devices and "sandwich" type measuring sections, a separate wire must be provided to connect to
the equipotential bonding. This wire is connected to the outer PA terminal.
Remote systems can either be included in the equipotential bonding via the PA connection in the
converter's terminal compartment or via the external PA connection on the wall bracket.
CAUTION!
Equipotential bonding
Equipotential bonding Equipotential bonding Equipotential bonding
Vortex flowmeter converters must be included in on-site equipotential bonding as per EN60079-
14! They are connected to the PA terminals.
1 Terminal compartment closed
2 Terminal compartment open
3 Connection A: Current output 4...20 mA (-)
4 Connection A+:Current output 4...20 mA (+)
5 Connection B: pulse / status output (-)
6 Connection B+: pulse / status output (+)
7 PA connection interior
8 PA connection exterior
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